Subcutaneous GLP-1 pens must be delivered into the adipose layer beneath the skin. Repeating the exact same spot causes lipohypertrophy (rubbery subcutaneous nodules) that impairs drug bioavailability.
The 6 FDA/EMA Approved Subcutaneous Zones
- Left & Right Abdomen: At least 2 inches (5 cm) away from the navel.
- Left & Right Front/Outer Thigh: Middle third of the thigh while seated.
- Left & Right Back of Upper Arm: Outer posterior triceps area.